The commit referenced below performs additional checking on
devices used for DMA. Specifically it checks that
device->dma_mask != NULL
Rdma_rxe uses this device when pinning MR memory but did not
set the value of dma_mask. In fact rdma_rxe does not perform
any DMA operations so the value is never used but is checked.
This patch gives dma_mask a valid value. It also removes unnecessary
logic which was setting dev->parent. It is equivalent to the patch
submitted by Parav Pandit.
Fixes: f959dcd6ddfd2 ("dma-direct: Fix potential NULL pointer dereference")
Signed-off-by: Bob Pearson <rpearson@xxxxxxx>
---
drivers/infiniband/sw/rxe/rxe_loc.h | 1 -
drivers/infiniband/sw/rxe/rxe_net.c | 12 ------------
drivers/infiniband/sw/rxe/rxe_verbs.c | 10 ++++++++--
3 files changed, 8 insertions(+), 15 deletions(-)
diff --git a/drivers/infiniband/sw/rxe/rxe_loc.h b/drivers/infiniband/sw/rxe/rxe_loc.h
index 0d758760b9ae..8adcef54e4b3 100644
--- a/drivers/infiniband/sw/rxe/rxe_loc.h
+++ b/drivers/infiniband/sw/rxe/rxe_loc.h
@@ -116,7 +116,6 @@ struct sk_buff *rxe_init_packet(struct rxe_dev *rxe, struct rxe_av *av,
int paylen, struct rxe_pkt_info *pkt);
int rxe_prepare(struct rxe_pkt_info *pkt, struct sk_buff *skb, u32 *crc);
const char *rxe_parent_name(struct rxe_dev *rxe, unsigned int port_num);
-struct device *rxe_dma_device(struct rxe_dev *rxe);
int rxe_mcast_add(struct rxe_dev *rxe, union ib_gid *mgid);
int rxe_mcast_delete(struct rxe_dev *rxe, union ib_gid *mgid);
diff --git a/drivers/infiniband/sw/rxe/rxe_net.c b/drivers/infiniband/sw/rxe/rxe_net.c
index 575e1a4ec821..2b4238cdeab9 100644
--- a/drivers/infiniband/sw/rxe/rxe_net.c
+++ b/drivers/infiniband/sw/rxe/rxe_net.c
@@ -20,18 +20,6 @@
static struct rxe_recv_sockets recv_sockets;
-struct device *rxe_dma_device(struct rxe_dev *rxe)
-{
- struct net_device *ndev;
-
- ndev = rxe->ndev;
-
- if (is_vlan_dev(ndev))
- ndev = vlan_dev_real_dev(ndev);
-
- return ndev->dev.parent;
-}
-
int rxe_mcast_add(struct rxe_dev *rxe, union ib_gid *mgid)
{
int err;
diff --git a/drivers/infiniband/sw/rxe/rxe_verbs.c b/drivers/infiniband/sw/rxe/rxe_verbs.c
index 7652d53af2c1..6afbb507ddb1 100644
--- a/drivers/infiniband/sw/rxe/rxe_verbs.c
+++ b/drivers/infiniband/sw/rxe/rxe_verbs.c
@@ -1128,19 +1128,25 @@ int rxe_register_device(struct rxe_dev *rxe, const char *ibdev_name)
int err;
struct ib_device *dev = &rxe->ib_dev;
struct crypto_shash *tfm;
+ u64 dma_mask;
strlcpy(dev->node_desc, "rxe", sizeof(dev->node_desc));
dev->node_type = RDMA_NODE_IB_CA;
dev->phys_port_cnt = 1;
dev->num_comp_vectors = num_possible_cpus();
- dev->dev.parent = rxe_dma_device(rxe);
dev->local_dma_lkey = 0;
addrconf_addr_eui48((unsigned char *)&dev->node_guid,
rxe->ndev->dev_addr);
dev->dev.dma_parms = &rxe->dma_parms;
dma_set_max_seg_size(&dev->dev, UINT_MAX);
- dma_set_coherent_mask(&dev->dev, dma_get_required_mask(&dev->dev));
+ dma_mask = IS_ENABLED(CONFIG_64BIT) ? DMA_BIT_MASK(64)
+ : DMA_BIT_MASK(32);
+ err = dma_coerce_mask_and_coherent(&dev->dev, dma_mask);
+ if (err) {
+ pr_warn("unable to set dma_mask, err = %d\n", err);
+ return err;
+ }
dev->uverbs_cmd_mask |= BIT_ULL(IB_USER_VERBS_CMD_REQ_NOTIFY_CQ);
--
2.27.0
